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Merge branch 'for-5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq

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Pull workqueue update from Tejun Heo:
 "The same as the cgroup tree - one commit which was scheduled for the
  5.11 merge window.

  All the commit does is avoding spurious worker wakeups from workqueue
  allocation / config change path to help cpuisol use cases"

* 'for-5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq:
  workqueue: Kick a worker based on the actual activation of delayed works
This commit is contained in:
Linus Torvalds 2020-12-28 11:23:02 -08:00
commit c76e02c59e
1 changed files with 10 additions and 3 deletions
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13
kernel/workqueue.c
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@ -3731,17 +3731,24 @@ static void pwq_adjust_max_active(struct pool_workqueue *pwq)
* is updated and visible.
*/
if (!freezable || !workqueue_freezing) {
bool kick = false;
pwq->max_active = wq->saved_max_active;
while (!list_empty(&pwq->delayed_works) &&
pwq->nr_active < pwq->max_active)
pwq->nr_active < pwq->max_active) {
pwq_activate_first_delayed(pwq);
kick = true;
}
/*
* Need to kick a worker after thawed or an unbound wq's
* max_active is bumped. It's a slow path. Do it always.
* max_active is bumped. In realtime scenarios, always kicking a
* worker will cause interference on the isolated cpu cores, so
* let's kick iff work items were activated.
*/
wake_up_worker(pwq->pool);
if (kick)
wake_up_worker(pwq->pool);
} else {
pwq->max_active = 0;
}